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Pros

Pro

Very little LED bleed

Because the Romer-G switches actually have LEDs inside them, which is impossible with MX, Kailh, Topre, etc. switches, it's very difficult for any of the light to bleed out. It still happens a bit, but not much.

Pro

LUA scripting

LGS has a LUA scripting engine in case its macro capabilities aren't enough. Unfortunately, scripts are wholly separate from macros, so you can't save scripts and then use the GUI to assign them to keys.

Pro

Lots of macro keys

G1-G5 are easy to reach, G6-G9 less so. There are also M1, M2, and M3 profiles, each of which can hold a complete set of G-keys. LGS can also configure this per-game, so players of multiple MMOs can have three sets of G-keys for each MMO rather than just three total.

Pro

Windows key locking

Most keyboards support this in one form or another, but the G910 has a nice big button next to the lock LEDs.

Pro

Media keys

Like most large gaming keyboards and unlike smaller, general-purpose keyboards (Ducky, Leopold, Topre, etc.), the G910 has a full set of media keys (play/pause, stop, rewind, fast-forward, mute, and a volume roller).

Pro

Arx Dock

Instead of the LCD screen that Logitech put into several previous keyboards, the G910 has a phone dock and iOS/Android app. This has several advantages over the embedded screen, mostly lower cost and the ability to control the screen on its own. Arx Control can monitor system temperatures and clocks and even launch games.

Pro

Logitech Gaming Software

The G-keys and lighting have tons of configuration options in LGS. This is also a pro for users of Logitech G-Series mice and headsets, as you only need one software installation to work with all of them.

Pro

RGB backlighting

Cons

Con

Lighting modes are restrictive

Each key can be set individually, but if you want any animation then it has to be across the whole keyboard. I wanted to animate my number pad.

Con

Feet are rather short

The G910 is almost completely horizontal with the feet out, and it actually angles backward with them retracted. Longer legs would help a lot.

Con

Wrist rest cannot be removed

The G910 has a wrist rest skeleton built onto it. It comes with two covers, one of which covers the skeleton and the other of which extends it, but it cannot be removed. The picture up top is the larger of the two rests, so it makes the problem appear somewhat worse than it is to those who would prefer none at all.

Con

Keycap font

The keycap font is one more of the stereotypical "edgy gamer" versions. In my opinion it's better than Cooler Master's or Razer's, but it still can't touch good old Arial et al.

Con

No custom keycaps

Romer-G switches have completely different stems from all existing switches, so there are precisely zero custom caps so far. Their design also looks like it would make custom caps rather difficult to produce compared to MX caps.

Con

Short key travel distance

The G910's Romer-G switches have a longer travel distance than most domes, but it's noticeably shorter than Cherry MX switches.